// Copyright (c) 2009-2010 Satoshi Nakamoto
+// Copyright (c) 2009-2012 The Bitcoin developers
// Distributed under the MIT/X11 software license, see the accompanying
-// file license.txt or http://www.opensource.org/licenses/mit-license.php.
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#ifndef BITCOIN_BIGNUM_H
#define BITCOIN_BIGNUM_H
#include <vector>
#include <openssl/bn.h>
-#include "util.h"
+#include "util.h" // for uint64
+/** Errors thrown by the bignum class */
class bignum_error : public std::runtime_error
{
public:
};
-
+/** RAII encapsulated BN_CTX (OpenSSL bignum context) */
class CAutoBN_CTX
{
protected:
};
-
+/** C++ wrapper for BIGNUM (OpenSSL bignum) */
class CBigNum : public BIGNUM
{
public:
BN_clear_free(this);
}
- CBigNum(char n) { BN_init(this); if (n >= 0) setulong(n); else setint64(n); }
+ //CBigNum(char n) is not portable. Use 'signed char' or 'unsigned char'.
+ CBigNum(signed char n) { BN_init(this); if (n >= 0) setulong(n); else setint64(n); }
CBigNum(short n) { BN_init(this); if (n >= 0) setulong(n); else setint64(n); }
CBigNum(int n) { BN_init(this); if (n >= 0) setulong(n); else setint64(n); }
CBigNum(long n) { BN_init(this); if (n >= 0) setulong(n); else setint64(n); }
{
unsigned long n = BN_get_word(this);
if (!BN_is_negative(this))
- return (n > INT_MAX ? INT_MAX : n);
+ return (n > (unsigned long)std::numeric_limits<int>::max() ? std::numeric_limits<int>::max() : n);
else
- return (n > INT_MAX ? INT_MIN : -(int)n);
+ return (n > (unsigned long)std::numeric_limits<int>::max() ? std::numeric_limits<int>::min() : -(int)n);
}
- void setint64(int64 n)
+ void setint64(int64 sn)
{
- unsigned char pch[sizeof(n) + 6];
+ unsigned char pch[sizeof(sn) + 6];
unsigned char* p = pch + 4;
- bool fNegative = false;
- if (n < (int64)0)
+ bool fNegative;
+ uint64 n;
+
+ if (sn < (int64)0)
{
- n = -n;
+ // Since the minimum signed integer cannot be represented as positive so long as its type is signed, and it's not well-defined what happens if you make it unsigned before negating it, we instead increment the negative integer by 1, convert it, then increment the (now positive) unsigned integer by 1 to compensate
+ n = -(sn + 1);
+ ++n;
fNegative = true;
+ } else {
+ n = sn;
+ fNegative = false;
}
+
bool fLeadingZeroes = true;
for (int i = 0; i < 8; i++)
{
BN_mpi2bn(pch, p - pch, this);
}
+ uint64 getuint64()
+ {
+ unsigned int nSize = BN_bn2mpi(this, NULL);
+ if (nSize < 4)
+ return 0;
+ std::vector<unsigned char> vch(nSize);
+ BN_bn2mpi(this, &vch[0]);
+ if (vch.size() > 4)
+ vch[4] &= 0x7f;
+ uint64 n = 0;
+ for (unsigned int i = 0, j = vch.size()-1; i < sizeof(n) && j >= 4; i++, j--)
+ ((unsigned char*)&n)[i] = vch[j];
+ return n;
+ }
+
void setuint64(uint64 n)
{
unsigned char pch[sizeof(n) + 6];
BN_mpi2bn(pch, p - pch, this);
}
- uint256 getuint256()
+ uint256 getuint256() const
{
unsigned int nSize = BN_bn2mpi(this, NULL);
if (nSize < 4)
if (vch.size() > 4)
vch[4] &= 0x7f;
uint256 n = 0;
- for (int i = 0, j = vch.size()-1; i < sizeof(n) && j >= 4; i++, j--)
+ for (unsigned int i = 0, j = vch.size()-1; i < sizeof(n) && j >= 4; i++, j--)
((unsigned char*)&n)[i] = vch[j];
return n;
}
+
void setvch(const std::vector<unsigned char>& vch)
{
std::vector<unsigned char> vch2(vch.size() + 4);
unsigned int nSize = vch.size();
+ // BIGNUM's byte stream format expects 4 bytes of
+ // big endian size data info at the front
vch2[0] = (nSize >> 24) & 0xff;
vch2[1] = (nSize >> 16) & 0xff;
vch2[2] = (nSize >> 8) & 0xff;
vch2[3] = (nSize >> 0) & 0xff;
+ // swap data to big endian
reverse_copy(vch.begin(), vch.end(), vch2.begin() + 4);
BN_mpi2bn(&vch2[0], vch2.size(), this);
}
std::vector<unsigned char> getvch() const
{
unsigned int nSize = BN_bn2mpi(this, NULL);
- if (nSize < 4)
+ if (nSize <= 4)
return std::vector<unsigned char>();
std::vector<unsigned char> vch(nSize);
BN_bn2mpi(this, &vch[0]);
psz++;
// hex string to bignum
- static char phexdigit[256] = { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,1,2,3,4,5,6,7,8,9,0,0,0,0,0,0, 0,0xa,0xb,0xc,0xd,0xe,0xf,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0xa,0xb,0xc,0xd,0xe,0xf,0,0,0,0,0,0,0,0,0 };
+ static const signed char phexdigit[256] = { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,1,2,3,4,5,6,7,8,9,0,0,0,0,0,0, 0,0xa,0xb,0xc,0xd,0xe,0xf,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0xa,0xb,0xc,0xd,0xe,0xf,0,0,0,0,0,0,0,0,0 };
*this = 0;
while (isxdigit(*psz))
{
*this <<= 4;
- int n = phexdigit[*psz++];
+ int n = phexdigit[(unsigned char)*psz++];
*this += n;
}
if (fNegative)
return ToString(16);
}
- unsigned int GetSerializeSize(int nType=0, int nVersion=VERSION) const
+ unsigned int GetSerializeSize(int nType=0, int nVersion=PROTOCOL_VERSION) const
{
return ::GetSerializeSize(getvch(), nType, nVersion);
}
template<typename Stream>
- void Serialize(Stream& s, int nType=0, int nVersion=VERSION) const
+ void Serialize(Stream& s, int nType=0, int nVersion=PROTOCOL_VERSION) const
{
::Serialize(s, getvch(), nType, nVersion);
}
template<typename Stream>
- void Unserialize(Stream& s, int nType=0, int nVersion=VERSION)
+ void Unserialize(Stream& s, int nType=0, int nVersion=PROTOCOL_VERSION)
{
std::vector<unsigned char> vch;
::Unserialize(s, vch, nType, nVersion);
CBigNum& operator>>=(unsigned int shift)
{
// Note: BN_rshift segfaults on 64-bit if 2^shift is greater than the number
- // if built on ubuntu 9.04 or 9.10, probably depends on version of openssl
+ // if built on ubuntu 9.04 or 9.10, probably depends on version of OpenSSL
CBigNum a = 1;
a <<= shift;
if (BN_cmp(&a, this) > 0)
git://git.novaco.in / novacoin.git / blobdiff